I have a custom wedding ring I am working on that will be cast in
silver in the next couple of days. I am setting a 2 ct stone in a
gold head. Can this head be cast in place and not be ruined. I
haven't had much luck soldering gold to silver. I have also been away
from the bench for about 10 years so I am a little rusty. The design
is beautiful so I want this to turn out.

You need to find someone thatv has cast your stone into silver
before you try it, otherwise it could be an expensive exercise for
you. If the client designed the ring, you need to be sure you can
make it. soldering gold to silver is no problem assuming you have the
right solder to use for this project.

As always run a trial first with some of the same metal to be sure
it will do what you want it to.

Making something utside of your normal skill set is always a time
consuming process.

Yolanda - soldering gold to silver is no big deal - if you have 18Kor higher gold. Lower alloys often "melt" into the silver. (JimBinnion can explain why) If you have to do 14k - and don't doanything lower - I'd proceed this way:

Prep your ring - mechanically locate the correct position for thehead. If it is a peg, drill the hole, if a bezel, create tiny biteswith a graver either inside or outside the bezel location, dependingon cleanup possibilities. If a basket, do them outside, they wouldshow inside because you can't clean them up. At least in some wayassure that the position for the head is mechanically set - it is tooeasy when out of practice to accidently move the head while heatingthe joint.

Clean and prep the head and "tin" it with easy solder - 14k, in acouple of places, but not necessarily covering the join location.

Heat the fluxed ring in a third hand or some stable prop with yourleft hand on the torch. With your prepped head, protected withalcohol and boric acid mixture, in your right hand, bring it to thering while maintaining heat on the ring. Gently warm the head whilebringing it to the ring. Then position the head on the ring and letthe heat of the ring heat the head and in the process pull the twotogether. (Use TINY bits of solder)

Or take it to a local goldsmith to do the joint. Or find someonewith a fusion welder and it's no big deal.

It has been my experience that fusing gold to silver takes practiceand frequent repetition. If not done exactly right, it yields a veryexpensive silver alloy, as the silver melts before the (high karat)gold and runs all over/alloys with the gold. Low karat gold won'tcontrast enough with silver to beworth even trying, IMO.

In the past, I always used silver solder to attach silver and gold,but now... Well, there's no one size fits all answer.